The 120GB version limps in at acceptable for some, but by our estimation falls far short of delivering performance that would be suitable for a normal consumer. Endurance does become a concern with this capacity point, falling in at 3.5-4 years of light usage. Users looking for a 120GB SSD would be best suited to stick with an MLC product, period. The worst aspect is the extreme amount of read degradation that this SSD suffers once it reaches steady state. The read speed of the 120GB 840 is supposed to be its most redeeming quality, but once in steady state it dropped to the bottom of our charts. Taking away the one advantage of this drive leaves us with nothing more to say.

The results of our latency testing initially raised the red flag. We knew that we were going to encounter slow write speeds with this SSD, but what we did not expect was to receive abysmal maximum read and write latency. Latency spikes of this nature are undoubtedly going to lead to interruptions in the flow of computing for users. SSDs with appreciably lower maximum latency can still experience the occasional hiccup, but with ranges of up to 67ms (three times higher than the nearest competing SSD) there is guaranteed to be laggy performance in many scenarios. Users will become accustomed to staring at the little blue spinning circle with this SSD in their system.

The slow sequential speed of the SSD will make simple procedures, such as copying pictures and videos, long drawn out affairs. Bear in mind that some 5400rpm HDDs can write at initial speeds of 140MB/s, and sustain a speed of 80-90MB/s. The fact that the 130MB/s that this SSD provides is even in the range of a 5400rpm HDD speaks volumes.

Users looking for a 120GB or less capacity SSD should stick with MLC products.

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